J.K. Rowling, 10: All seven Harry Potter books, of course (the hardcovers in the boxed suitcase-like set), plus a few scattered old paperback editions of the earlier titles in the series. Plus A Casual Vacancy and the first Robert Galbraith book, and that makes 10+.
Ernest Hemingway, 11: I long ago decided to try to sit down to read everything Hemingway has ever written, and while I'm still far from accomplishing that goal, I've got a good collection going: The Old Man and the Sea, two editions of The Short Stories of Ernest Hemingway, Islands in the Stream, To Have and Have Not, The Sun Also Rises, For Whom the Bell Tolls, two editions of A Moveable Feast, a second e-book version of The Sun Also Rises, The Snows of Kilimanjaro. That's 11, and since I'm doing this from memory, I think I missed a few. (Bonus points to Hemingway because of the many Hemingway-themed reading I have, including Hemingway's Boat, Hemingway's Girl, The Paris Wife, and Mrs. Hemingway.)
F. Scott Fitzgerald, 6: I'm a sucker for a pretty edition, and Coralie Bickford Smith's decadent volumes of Fitzgerald's works are no exception. In addition to my battered old paperback copy of The Great Gatsby, which has survived the decade+ since I first read it in high school, I have two of Fitzgerald's novellas from Melville House's Art of the Novella series, The Beautiful and Damned, This Side of Paradise, and Tender is the Night. (Bonus points to Fitzgerald because I own two novelizations of his wife's life, Z and Call Me Zelda, plus two Out of Print Gatsby-themed shirts.)
Margaret Atwood, 6: Oh Margaret Atwood, how I love thee. On my shelf: the Maddaddam trilogy, The Handmaid's Tale, Cat's Eye, Alias Grace.
Robert Jordan (and Brandon Sanderson), 15: I've written before about my undying love for Robert Jordan's Wheel of Time series, and with fourteen volumes in all, let's just say this dominates my shelves. (Doesn't hurt that I own two copies of the first book in the series, Eye of the World.) On top of that, my husband and I collectively own most, if not all, of Sanderson's other works.
This post is part of Top Ten Tuesday, hosted by The Broke and the Bookish.